My startup is looking to use SMS as our primary way of interacting with users but are a bit worried about the cost. We don't need a short code so so far these are the options we've come up with:
1 )asking users for their carrier and using the carrier's SMTP gateway (1234567890@txt.att.net)
2) once they blacklist us for having too much traffic, using multiple IP/SMTP addresses
3) switching to using GMS modems (essentially SIM cards with unlimited messaging plans plugged into our server)
4) working with a 4Info or Movoxx to have them subsidize our costs with their ads
5) finally succumbing and using an aggregator
Does anyone know of any other options? Anyone have experience using the SMTP gateways and how much traffic carriers will allow before they start blocking? Once blocked, can I just change SMTP or IP addresses? Anyone have any advice on how to go the GSM modem route?
